We have an 18yr old Marshall pocket coil mattress that we came to love.... a bit too firm at first but after break in was great. I am a 200 lb side sleeper and my wife is 130 lbs and a side sleeper. In the last few months one side only is causing me to awake from pressure points... mainly shoulders. I hate a hot mattress so have no interest in memory foam. I have been researching latex. Also wondering about a latex topper. We live in the Toronto area (hence the Marshall). Don't wish to drop $3000 on a mattress we might not like. Contemplating another Marshall or a latex at a place we can switch out of if not happy. Any advice would be great.